Haha! Sorry for digging up an old thread, but I got a bit of nostalgia and googled my name on this forum (somehow I still remember my old account details), only to see I was mentioned so recently.
Yep, a lot of the tiles are ripped from Star Ocean iirc, a few other things in there too, and some original stuff (smaller percentage of original art than in my other abandoned projects, but at that point I was more focused on getting an engine running than art).
The plan for having such ridiculously complex maps was storing them as pics, with matrices storing bounding boxes for collision detection and separate sprites for any objects drawn above the character (like the arch in that gif).
I still feel bad about never finishing anything

Surprised to see some familiar faces still around.
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"You're very clever, young man, but it's turtles all the way down!"